/*
 * Copyright (c) 2014, Peter Thorson. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the WebSocket++ Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef HTTP_CONSTANTS_HPP
#define HTTP_CONSTANTS_HPP

#include <exception>
#include <map>
#include <string>
#include <vector>
#include <utility>

namespace websocketpp
{
/// HTTP handling support
namespace http
{
/// The type of an HTTP attribute list
/**
 * The attribute list is an unordered key/value map. Encoded attribute
 * values are delimited by semicolons.
 */
typedef std::map<std::string, std::string> attribute_list;

/// The type of an HTTP parameter list
/**
 * The parameter list is an ordered pairing of a parameter and its
 * associated attribute list. Encoded parameter values are delimited by
 * commas.
 */
typedef std::vector< std::pair<std::string, attribute_list> > parameter_list;

/// Literal value of the HTTP header delimiter
static char const header_delimiter[] = "\r\n";

/// Literal value of the HTTP header separator
static char const header_separator[] = ":";

/// Literal value of an empty header
static std::string const empty_header;

/// Maximum size in bytes before rejecting an HTTP header as too big.
size_t const max_header_size = 16000;

/// Default Maximum size in bytes for HTTP message bodies.
size_t const max_body_size = 32000000;

/// Number of bytes to use for temporary istream read buffers
size_t const istream_buffer = 512;

/// invalid HTTP token characters
/**
 * 0x00 - 0x32, 0x7f-0xff
 * ( ) < > @ , ; : \ " / [ ] ? = { }
 */
static char const header_token[] = {
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 00..0f
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 10..1f
  0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, // 20..2f
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 30..3f
  0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 40..4f
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, // 50..5f
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 60..6f
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, // 70..7f
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80..8f
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 90..9f
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // a0..af
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // b0..bf
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // c0..cf
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // d0..df
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // e0..ef
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // f0..ff
};

/// Is the character a token
inline bool is_token_char (unsigned char c)
{
  return (header_token[c] == 1);
}

/// Is the character a non-token
inline bool is_not_token_char (unsigned char c)
{
  return !header_token[c];
}

/// Is the character whitespace
/**
 * whitespace is space (32) or horizontal tab (9)
 */
inline bool is_whitespace_char (unsigned char c)
{
  return (c == 9 || c == 32);
}

/// Is the character non-whitespace
inline bool is_not_whitespace_char (unsigned char c)
{
  return (c != 9 && c != 32);
}

/// HTTP Status codes
namespace status_code
{
enum value {
  uninitialized = 0,

  continue_code = 100,
  switching_protocols = 101,

  ok = 200,
  created = 201,
  accepted = 202,
  non_authoritative_information = 203,
  no_content = 204,
  reset_content = 205,
  partial_content = 206,

  multiple_choices = 300,
  moved_permanently = 301,
  found = 302,
  see_other = 303,
  not_modified = 304,
  use_proxy = 305,
  temporary_redirect = 307,

  bad_request = 400,
  unauthorized = 401,
  payment_required = 402,
  forbidden = 403,
  not_found = 404,
  method_not_allowed = 405,
  not_acceptable = 406,
  proxy_authentication_required = 407,
  request_timeout = 408,
  conflict = 409,
  gone = 410,
  length_required = 411,
  precondition_failed = 412,
  request_entity_too_large = 413,
  request_uri_too_long = 414,
  unsupported_media_type = 415,
  request_range_not_satisfiable = 416,
  expectation_failed = 417,
  im_a_teapot = 418,
  upgrade_required = 426,
  precondition_required = 428,
  too_many_requests = 429,
  request_header_fields_too_large = 431,

  internal_server_error = 500,
  not_implemented = 501,
  bad_gateway = 502,
  service_unavailable = 503,
  gateway_timeout = 504,
  http_version_not_supported = 505,
  not_extended = 510,
  network_authentication_required = 511
};

// TODO: should this be inline?
inline std::string get_string (value c)
{
  switch (c) {
  case uninitialized:
    return "Uninitialized";

  case continue_code:
    return "Continue";

  case switching_protocols:
    return "Switching Protocols";

  case ok:
    return "OK";

  case created:
    return "Created";

  case accepted:
    return "Accepted";

  case non_authoritative_information:
    return "Non Authoritative Information";

  case no_content:
    return "No Content";

  case reset_content:
    return "Reset Content";

  case partial_content:
    return "Partial Content";

  case multiple_choices:
    return "Multiple Choices";

  case moved_permanently:
    return "Moved Permanently";

  case found:
    return "Found";

  case see_other:
    return "See Other";

  case not_modified:
    return "Not Modified";

  case use_proxy:
    return "Use Proxy";

  case temporary_redirect:
    return "Temporary Redirect";

  case bad_request:
    return "Bad Request";

  case unauthorized:
    return "Unauthorized";

  case payment_required:
    return "Payment Required";

  case forbidden:
    return "Forbidden";

  case not_found:
    return "Not Found";

  case method_not_allowed:
    return "Method Not Allowed";

  case not_acceptable:
    return "Not Acceptable";

  case proxy_authentication_required:
    return "Proxy Authentication Required";

  case request_timeout:
    return "Request Timeout";

  case conflict:
    return "Conflict";

  case gone:
    return "Gone";

  case length_required:
    return "Length Required";

  case precondition_failed:
    return "Precondition Failed";

  case request_entity_too_large:
    return "Request Entity Too Large";

  case request_uri_too_long:
    return "Request-URI Too Long";

  case unsupported_media_type:
    return "Unsupported Media Type";

  case request_range_not_satisfiable:
    return "Requested Range Not Satisfiable";

  case expectation_failed:
    return "Expectation Failed";

  case im_a_teapot:
    return "I'm a teapot";

  case upgrade_required:
    return "Upgrade Required";

  case precondition_required:
    return "Precondition Required";

  case too_many_requests:
    return "Too Many Requests";

  case request_header_fields_too_large:
    return "Request Header Fields Too Large";

  case internal_server_error:
    return "Internal Server Error";

  case not_implemented:
    return "Not Implemented";

  case bad_gateway:
    return "Bad Gateway";

  case service_unavailable:
    return "Service Unavailable";

  case gateway_timeout:
    return "Gateway Timeout";

  case http_version_not_supported:
    return "HTTP Version Not Supported";

  case not_extended:
    return "Not Extended";

  case network_authentication_required:
    return "Network Authentication Required";

  default:
    return "Unknown";
  }
}
}

class exception : public std::exception
{
public:
  exception (const std::string &log_msg,
             status_code::value error_code,
             const std::string &error_msg = std::string(),
             const std::string &body = std::string() )
    : m_msg (log_msg)
    , m_error_msg (error_msg)
    , m_body (body)
    , m_error_code (error_code) {}

  ~exception() throw() {}

  virtual const char *what() const throw()
  {
    return m_msg.c_str();
  }

  std::string         m_msg;
  std::string         m_error_msg;
  std::string         m_body;
  status_code::value  m_error_code;
};
}
}

#endif // HTTP_CONSTANTS_HPP
